Abstract

Summary In Daqing Oilfield, the commercial industrial application of polymer flooding began in 1995, and the incremental oil recovery factor is more than 14%, indicating that the polymer flooding technology is very successful in Daqing Oilfield. But the polymer solution has to be prepared with fresh water and diluted by produced water, worsening the oil displacement effect of polymer flooding. In order to further improve the development effect of polymer flooding, this paper carried out researches and field trials on linear salt-resistant polymer flooding. The molecule of linear salt-resistant polymer is distributed in the form of linear chain in solution. Compared with conventional polymer, it has better oil displacement performance indexes, stronger viscosity stability and lower minimum permeability of oil reservoir for its injection. The physical simulation results show that the linear salt-resistant polymer has better oil displacement effect than that of conventional polymer, increasing oil displacement efficiency by 4.2%. In Daqing Oilfield, good oil recovery effect has been obtained in the pilot trial, commercial trial and industrial application of linear salt-resistant polymer flooding. The linear salt-resistant polymer flooding has become one important technology for improving the polymer flooding development effect in Daqing Oilfield.

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